Prestashop 1.5 problem with carts webservice

[qdssoftware]

Hello,

 

I'm developing some webservice features, can perform some operations without problems. But I cannot create a cart (needed for orders) because I get these errors:

<?xml version="1.0" encoding="UTF-8"?>
<prestashop xmlns:xlink="http://www.w3.org/1999/xlink">
<errors>
<error>
<code><![CDATA[11]]></code>
<message><![CDATA[[PHP User warning #512] Function <b>property_exists()</b> is deprecated in <b>/var/www/vhosts/polarteam.net/httpdocs/classes/WebserviceRequest.php</b> on line <b>1341</b><br /> (/var/www/vhosts/polarteam.net/httpdocs/classes/Tools.php, line 1843)]]></message>
</error>
<error>
<code><![CDATA[11]]></code>
<message><![CDATA[[PHP User warning #512] Function <b>property_exists()</b> is deprecated in <b>/var/www/vhosts/polarteam.net/httpdocs/classes/WebserviceRequest.php</b> on line <b>1341</b><br /> (/var/www/vhosts/polarteam.net/httpdocs/classes/Tools.php, line 1843)]]></message>
</error>
<error>
<code><![CDATA[11]]></code>
<message><![CDATA[[PHP User warning #512] Function <b>property_exists()</b> is deprecated in <b>/var/www/vhosts/polarteam.net/httpdocs/classes/WebserviceRequest.php</b> on line <b>1341</b><br /> (/var/www/vhosts/polarteam.net/httpdocs/classes/Tools.php, line 1843)]]></message>
</error>
.
.
.
<error>
<code><![CDATA[11]]></code>
<message><![CDATA[[PHP User warning #512] Function <b>property_exists()</b> is deprecated in <b>/var/www/vhosts/polarteam.net/httpdocs/classes/WebserviceRequest.php</b> on line <b>1341</b><br /> (/var/www/vhosts/polarteam.net/httpdocs/classes/Tools.php, line 1843)]]></message>
</error>
<error>
<code><![CDATA[11]]></code>
<message><![CDATA[[PHP User warning #512] Function <b>property_exists()</b> is deprecated in <b>/var/www/vhosts/polarteam.net/httpdocs/classes/WebserviceRequest.php</b> on line <b>1341</b><br /> (/var/www/vhosts/polarteam.net/httpdocs/classes/Tools.php, line 1843)]]></message>
</error>
<error>
<code><![CDATA[11]]></code>
<message><![CDATA[[PHP User warning #512] Function <b>property_exists()</b> is deprecated in <b>/var/www/vhosts/polarteam.net/httpdocs/classes/WebserviceRequest.php</b> on line <b>1341</b><br /> (/var/www/vhosts/polarteam.net/httpdocs/classes/Tools.php, line 1843)]]></message>
</error>
<error>
<code><![CDATA[11]]></code>
<message><![CDATA[[PHP User warning #512] Function <b>property_exists()</b> is deprecated in <b>/var/www/vhosts/polarteam.net/httpdocs/classes/WebserviceRequest.php</b> on line <b>1341</b><br /> (/var/www/vhosts/polarteam.net/httpdocs/classes/Tools.php, line 1843)]]></message>
</error>
</errors>
</prestashop>

My PHP Version is up to 5.3... Why this message "property_exists() is deprecated" ??

 

Any idea?  

 

Thanks in advance